fix: Support XHTML phrasing content in MathML token elements

[rschristian]

Fixes #4920

Fiddling w/ size & perf but I'm not really happy with this as it's such a niche need. MathML really should've reused <foreignObject> or created something similar.

[github-actions]

📊 Tachometer Benchmark Results

Summary

duration

• create10k: unsure 🔍 -0% - +0% (-2.47ms - +4.20ms)
  ^{preact-local vs preact-main}
• filter-list: unsure 🔍 -0% - -0% (-0.06ms - -0.00ms)
  ^{preact-local vs preact-main}
• hydrate1k: unsure 🔍 -1% - +2% (-1.02ms - +1.65ms)
  ^{preact-local vs preact-main}
• many-updates: unsure 🔍 -3% - +4% (-0.55ms - +0.73ms)
  ^{preact-local vs preact-main}
• replace1k: unsure 🔍 -1% - +2% (-0.56ms - +1.04ms)
  ^{preact-local vs preact-main}
• text-update: unsure 🔍 -4% - +11% (-0.09ms - +0.23ms)
  ^{preact-local vs preact-main}
• todo: slower ❌ 0% - 2% (0.09ms - 0.57ms)
  ^{preact-local vs preact-main}
• update10th1k: unsure 🔍 -4% - +2% (-1.32ms - +0.79ms)
  ^{preact-local vs preact-main}

usedJSHeapSize

• create10k: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
  ^{preact-local vs preact-main}
• filter-list: unsure 🔍 -0% - +0% (-0.00ms - +0.01ms)
  ^{preact-local vs preact-main}
• hydrate1k: unsure 🔍 -11% - +1% (-0.75ms - +0.07ms)
  ^{preact-local vs preact-main}
• many-updates: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
  ^{preact-local vs preact-main}
• replace1k: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
  ^{preact-local vs preact-main}
• text-update: unsure 🔍 -2% - +2% (-0.02ms - +0.02ms)
  ^{preact-local vs preact-main}
• todo: unsure 🔍 -1% - +0% (-0.01ms - +0.01ms)
  ^{preact-local vs preact-main}
• update10th1k: unsure 🔍 -0% - +0% (-0.00ms - +0.01ms)
  ^{preact-local vs preact-main}

Results

create10k

• Browser: chrome-headless
• Sample size: 50
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	908.13ms - 912.60ms	-	unsure 🔍 -0% - +0% -2.47ms - +4.20ms
preact-main	907.02ms - 911.98ms	unsure 🔍 -0% - +0% -4.20ms - +2.47ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	19.04ms - 19.04ms	-	unsure 🔍 -0% - +0% -0.00ms - +0.00ms
preact-main	19.04ms - 19.04ms	unsure 🔍 -0% - +0% -0.00ms - +0.00ms	-

filter-list

• Browser: chrome-headless
• Sample size: 50
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	16.53ms - 16.57ms	-	unsure 🔍 -0% - -0% -0.06ms - -0.00ms
preact-main	16.56ms - 16.61ms	unsure 🔍 +0% - +0% +0.00ms - +0.06ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	1.54ms - 1.54ms	-	unsure 🔍 -0% - +0% -0.00ms - +0.01ms
preact-main	1.54ms - 1.54ms	unsure 🔍 -0% - +0% -0.01ms - +0.00ms	-

hydrate1k

• Browser: chrome-headless
• Sample size: 90
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	68.52ms - 70.48ms	-	unsure 🔍 -1% - +2% -1.02ms - +1.65ms
preact-main	68.27ms - 70.09ms	unsure 🔍 -2% - +1% -1.65ms - +1.02ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	6.19ms - 6.66ms	-	unsure 🔍 -11% - +1% -0.75ms - +0.07ms
preact-main	6.42ms - 7.10ms	unsure 🔍 -1% - +12% -0.07ms - +0.75ms	-

many-updates

• Browser: chrome-headless
• Sample size: 60
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	16.24ms - 17.13ms	-	unsure 🔍 -3% - +4% -0.55ms - +0.73ms
preact-main	16.14ms - 17.06ms	unsure 🔍 -4% - +3% -0.73ms - +0.55ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	3.72ms - 3.72ms	-	unsure 🔍 -0% - +0% -0.00ms - +0.00ms
preact-main	3.72ms - 3.72ms	unsure 🔍 -0% - +0% -0.00ms - +0.00ms	-

replace1k

• Browser: chrome-headless
• Sample size: 100
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	61.56ms - 62.65ms	-	unsure 🔍 -1% - +2% -0.56ms - +1.04ms
preact-main	61.28ms - 62.45ms	unsure 🔍 -2% - +1% -1.04ms - +0.56ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	2.99ms - 2.99ms	-	unsure 🔍 -0% - +0% -0.00ms - +0.00ms
preact-main	2.98ms - 2.99ms	unsure 🔍 -0% - +0% -0.00ms - +0.00ms	-

run-warmup-0

Version	Avg time	vs preact-local	vs preact-main
preact-local	25.04ms - 25.84ms	-	unsure 🔍 -2% - +2% -0.55ms - +0.61ms
preact-main	24.99ms - 25.83ms	unsure 🔍 -2% - +2% -0.61ms - +0.55ms	-

run-warmup-1

Version	Avg time	vs preact-local	vs preact-main
preact-local	31.77ms - 32.76ms	-	unsure 🔍 -2% - +2% -0.76ms - +0.62ms
preact-main	31.85ms - 32.82ms	unsure 🔍 -2% - +2% -0.62ms - +0.76ms	-

run-warmup-2

Version	Avg time	vs preact-local	vs preact-main
preact-local	31.31ms - 32.01ms	-	unsure 🔍 -2% - +2% -0.54ms - +0.48ms
preact-main	31.32ms - 32.06ms	unsure 🔍 -2% - +2% -0.48ms - +0.54ms	-

run-warmup-3

Version	Avg time	vs preact-local	vs preact-main
preact-local	24.49ms - 24.80ms	-	unsure 🔍 -1% - +1% -0.29ms - +0.18ms
preact-main	24.52ms - 24.88ms	unsure 🔍 -1% - +1% -0.18ms - +0.29ms	-

run-warmup-4

Version	Avg time	vs preact-local	vs preact-main
preact-local	26.04ms - 27.57ms	-	unsure 🔍 -2% - +6% -0.55ms - +1.57ms
preact-main	25.56ms - 27.02ms	unsure 🔍 -6% - +2% -1.57ms - +0.55ms	-

run-final

Version	Avg time	vs preact-local	vs preact-main
preact-local	20.48ms - 21.04ms	-	unsure 🔍 -1% - +3% -0.20ms - +0.60ms
preact-main	20.28ms - 20.85ms	unsure 🔍 -3% - +1% -0.60ms - +0.20ms	-

text-update

• Browser: chrome-headless
• Sample size: 240
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	2.10ms - 2.32ms	-	unsure 🔍 -4% - +11% -0.09ms - +0.23ms
preact-main	2.03ms - 2.26ms	unsure 🔍 -10% - +4% -0.23ms - +0.09ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	0.99ms - 1.02ms	-	unsure 🔍 -2% - +2% -0.02ms - +0.02ms
preact-main	0.99ms - 1.02ms	unsure 🔍 -2% - +2% -0.02ms - +0.02ms	-

todo

• Browser: chrome-headless
• Sample size: 50
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	31.34ms - 31.73ms	-	slower ❌ 0% - 2% 0.09ms - 0.57ms
preact-main	31.08ms - 31.34ms	faster ✔ 0% - 2% 0.09ms - 0.57ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	1.25ms - 1.26ms	-	unsure 🔍 -1% - +0% -0.01ms - +0.01ms
preact-main	1.25ms - 1.26ms	unsure 🔍 -0% - +1% -0.01ms - +0.01ms	-

update10th1k

• Browser: chrome-headless
• Sample size: 60
• Built by: CI #5166

• Commit: 86c70d6

duration

Version	Avg time	vs preact-local	vs preact-main
preact-local	32.16ms - 33.48ms	-	unsure 🔍 -4% - +2% -1.32ms - +0.79ms
preact-main	32.26ms - 33.90ms	unsure 🔍 -2% - +4% -0.79ms - +1.32ms	-

usedJSHeapSize

Version	Avg time	vs preact-local	vs preact-main
preact-local	2.94ms - 2.95ms	-	unsure 🔍 -0% - +0% -0.00ms - +0.01ms
preact-main	2.93ms - 2.94ms	unsure 🔍 -0% - +0% -0.01ms - +0.00ms	-

_{tachometer-reporter-action v2 for CI}

[github-actions]

Size Change: +105 B (+0.22%)

Total Size: 47.5 kB

Filename	Size	Change
dist/preact.js	4.71 kB	+37 B (+0.79%)
dist/preact.mjs	4.73 kB	+36 B (+0.77%)
dist/preact.umd.js	4.79 kB	+32 B (+0.67%)

ℹ️ View Unchanged

Filename	Size
compat/dist/compat.js	3.9 kB
compat/dist/compat.mjs	3.82 kB
compat/dist/compat.umd.js	3.95 kB
debug/dist/debug.js	3.9 kB
debug/dist/debug.mjs	3.9 kB
debug/dist/debug.umd.js	3.98 kB
devtools/dist/devtools.js	263 B
devtools/dist/devtools.mjs	273 B
devtools/dist/devtools.umd.js	348 B
hooks/dist/hooks.js	1.53 kB
hooks/dist/hooks.mjs	1.56 kB
hooks/dist/hooks.umd.js	1.6 kB
jsx-runtime/dist/jsxRuntime.js	892 B
jsx-runtime/dist/jsxRuntime.mjs	861 B
jsx-runtime/dist/jsxRuntime.umd.js	966 B
test-utils/dist/testUtils.js	473 B
test-utils/dist/testUtils.mjs	473 B
test-utils/dist/testUtils.umd.js	555 B

_{compressed-size-action}

[coveralls]

coverage: 99.535%. remained the same
when pulling 86c70d6 on fix/xhtml-in-mathml
into 8e3e4ce on main.

[marvinhagemeister]

LGTM, nice fix!